Confidence interval around a proportion

This Excel spreadsheet provides the upper and lower bounds for confidence intervals surrounding a proportion.  This is useful for determining the precision of an estimate of a proportion from a given sample size.  For example, the true population proportion is expected to be within the bounds of a 95% confidence interval 95% of the time assuming unbiased sampling.

Confidence intervals around a proportion 2

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Dr. David R. Smith

David R. Smith, D.V.M., Ph.D., is the Mikell and Mary Cheek Hall Davis Endowed Professor and Beef Program Leader at Mississippi State University College of Veterinary Medicine. Earlier in his professional career he practiced food animal medicine and surgery. He is a board-certified veterinary epidemiologist with special interest in discovery and outreach regarding pre-harvest control of Shigatoxin producing Escherichia coli and Salmonella in cattle production systems. He also has research and extension activities in responsible use of antibiotics and methods to manage cattle populations to control the transmission of other pathogens important to cattle or human health, including Johne’s disease, BVDV, bovine respiratory disease and neonatal calf diarrhea. He currently serves on the Secretary of Agriculture’s Committee on Animal Health.